Yealink SIP-T2 SERIES Administrator's Manual page 557

Line Key/Expansion Module Key LED (configured as a BLF key or a BLF List key and BLF
LED Mode is set to 1)
LED Status
Fast flashing red (200ms)
Solid red
Slow flashing red (1s)
Off
Line Key/Expansion Module Key LED (configured as a BLF key or a BLF List key and BLF
LED Mode is set to 2)
LED Status
Fast flashing red (200ms)
Solid red
Slow flashing red (1s)
Off
Line Key/Expansion Module Key LED (configured as a BLF key or a BLF List key and BLF
LED Mode is set to 3)
LED Status
Fast flashing green
(200ms)
Solid red
Slow flashing red (1s)
Off
Description
The monitored user receives an incoming call.
The monitored user is dialing.
The monitored user is talking.
The monitored user's conversation is placed on hold
(This LED status requires server support).
The call is parked against the monitored user's phone
number.
The monitored user is idle.
The monitored user does not exist.
Description
The monitored user receives an incoming call.
The monitored user is dialing.
The monitored user is talking.
The monitored user's conversation is placed on hold
(This LED status requires server support).
The call is parked against the monitored user's phone
number.
The monitored user is idle.
The monitored user does not exist.
Description
The monitored user receives an incoming call.
The monitored user is dialing.
The monitored user is talking.
The monitored user's conversation is placed on hold
(This LED status requires server support).
The call is parked against the monitored user's phone
number.
The monitored user is idle.
The monitored user does not exist.
Configuring Advanced Features
535